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HA with 2 controller nodes (deployed by Fuel7)?

Hi!

Although high-availability configuration with 2 nodes should not be recommended for production I would like to know if anybody is using it. My current idea is to implement it in the private data center which is critical for development team but is not critical for true high available service. I would like to have 2 controllers because this servers are relatively old and I would like to have one available if the other one dies.

Is it just MySQL that is using Galera which requires 3 nodes the issue here? I wonder whether it would be a good option to make deployment with Fuel and then replace Galera with DRBD?

If anybody is using HA deployed with Fuel7 on 2 controllers, please share any experiences or information or if anybody knows what exact issues can I expect and where I can find more information to overcome those issues, let me know.

Thanks!